6 Use and Operation
MY Series (10kVA-40kVA) UPS
User Manual
92
Fault phenomenon
Possible reason
small power ones successively.
Buzzer long beeps, fault
indicator lights on, UPS works
in bypass mode and inverter
failure.
1.
The output is overload. The load is too heavy and beyond
the rated power of the UPS. Please reduce load or select a
UPS with larger power capacity. If it is temporary bypass
caused by impact of load start and recovers automatically,
it still is normal;
2.
UPS over-temperature protection. Check if the air inlet and
air outlet of UPS is blocked or the working temperature of
UPS is beyond the allowable range.
Usually, UPS works normally.
When power failure, it doesn't
transfer to battery mode or it
transfers to battery mode and
battery under-voltage protection
soon.
1.
Battery aging, the battery capacity loss. Please replace
battery;
2.
Battery charger fault. At ordinary time, the battery cannot
be charged;
3.
Battery wire doesn't connect well or the terminals contact is
bad.
When the load is PC, everything
works normally. When power
failure, UPS works normally,
but the computer system halted.
The grounding connection is not so good. The floating voltage
between the neutral wire and the grounding wire is too high.
Table6-2
Meaning of fault symbol and buzzer status
NO.
LCD fault
symbol
Buzzer status
Meaning
1
EPO
Long beep
UPS has emergency protection (if equipped with
EPO function), Bypass output and inverting output
are all closed.
2
Mode fault
Long beep
UPS system mode system settings and the actual
wiring do not match the fault, please check the
main power or bypass wiring, and make the actual
system is consistent with the set mode system.
3
Maintain
Long beep
UPS maintenance bypass protection, inverted